Industrial Engineering and Production Management
Travel charts provide

An idea of the flow of materials at various stages
An approximate estimate of the handling which must be done at a particular station
The information for changes required in rearranging material handling equipment
A compact estimate of the handling which must be done between various work sections

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Industrial Engineering and Production Management
Activity slack or float of any event on a PERT/CPM chart is represented by

Latest start time of succeeding event earliest finish time of preceding event activity time
Latest finish time of event earliest finish time of the event
Latest start time of the event earliest start time of the event
Anyone of the above

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